Balance Sheet Components (Available-for-Sale Investments in Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	$ 46,976	$ 76,813
Unrealized Loss, Less than 12 months	(69)	(181)
Corporate Bonds/Notes [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	1,490	1,490
Unrealized Loss, Less than 12 months	(11)	(13)
U.S. Government Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months	45,486	73,329
Unrealized Loss, Less than 12 months	$ (58)	(164)
Asset-Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fair Value, Less than 12 months		1,994
Unrealized Loss, Less than 12 months		$ (4)